Etymology:

Elements  ----  Mineral 钅 + inside 内 (na). Phonetic series 内.

It is the mineral 钅 with the sound “Na” 纳. 

Main Words:

钠泵 nàbèng sodium pump.

Discussion and sources

As in many other names of metals and minerals, here 内 or 纳 provide only the sound, as sodium sign in the chemical language is "Na".

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